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United States Patent | 6,088,558 |
Yamada ,   et al. | July 11, 2000 |
An image forming apparatus includes an endless belt, a pair of belt winding rollers that wind and rotate the endless belt, and a belt shift detecting device that detects a belt shift. The image forming apparatus further includes a roller end moving device that moves one end of one of the belt winding rollers around its other end in response to the detection of a belt shift to suppress the belt shift to a predetermined range, and a belt surface contacting device that pressure contacts the surface of the endless belt. The belt surface contacting device is mounted on a frame that supports a shaft of the belt winding roller to be moved so that its contacting condition does not change during the movement of the belt winding roller moved by the roller end moving device.
Inventors: | Yamada; Masamichi (Yokohama, JP); Kurotaka; Shigeo (Sagamihara, JP) |
Assignee: | Ricoh Company, Ltd. (Tokyo, JP) |
Appl. No.: | 263775 |
Filed: | March 5, 1999 |
Mar 05, 1998[JP] | 10-053769 | |
Sep 03, 1998[JP] | 10-248980 |
Current U.S. Class: | 399/165; 198/806; 399/329 |
Intern'l Class: | G03G 015/20; G03G 021/00 |
Field of Search: | 399/165,329,299,300 347/154 226/18,21,23,45 198/806 |
3818391 | Jun., 1974 | Jordon et al. | 198/202. |
4027966 | Jun., 1977 | Jordan | 198/806. |
4483607 | Nov., 1984 | Nagayama. | |
5157444 | Oct., 1992 | Mori et al. | 198/806. |
5343279 | Aug., 1994 | Nagata et al. | 198/806. |
5365321 | Nov., 1994 | Koshimizu et al. | |
5895153 | Apr., 1999 | Aslam et al. | 399/329. |